This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A180697 #7 Jan 17 2016 20:11:49 %S A180697 1,225,3375,437893890380859375,50625,6568408355712890625,759375, %T A180697 8649755859375,98526125335693359375, %U A180697 10894361101313487863732444325959303199624628177843987941741943359375 %N A180697 Smallest power of 15 that begins with n. %Y A180697 Cf. A180695, A180698, A180699. %K A180697 base,nonn %O A180697 1,2 %A A180697 _Daniel Mondot_, Sep 18 2010